AT43311 Просмотр технического описания (PDF) - Atmel Corporation

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AT43311

USB Hub

Atmel Corporation 

Get_Port_Status

Get_Port_Status returns the current port status and the states that have changed since the previous acknowledgment. The

AT43311 returns two words of data as described in the following two tables. Word0 is the Port Status Field, and Word1 is

the Port Change Field. The AT43311 will respond with a STALL if Port0 or a port higher than Port4 is addressed in this

request.

Port Status Field, wPortStatus

Bit Description

Current Connect Status: PORT_CONNECTION

0

0 = no device present on this port

1 = a device is present on this port

Port Enabled/Disabled: PORT_ENABLE

1

0 = Port is disabled

1 = Port is enabled

Suspend: PORT_SUSPEND

2

0 = Not suspended

1 = Suspended

Over-Current Indicator: PORT_OVER_CURRENT

3

0 = Power operation normal for this port

1 = Over-current condition exists for this port. Power to this port has been shut off.

Reset: PORT_RESET

4

0 = Reset signalling not asserted

1 = Reset signalling asserted

5-7 Reserved. Always read as 0’s.

Port Power: PORT_POWER

8

0 = This port is powered OFF

1 = This port is powered ON

Low Speed Device Attached: PORT_LOW_SPEED

9

0 = Full Speed device attached to this port

1 = Low Speed device attached to this port

10-15 Reserved. Always read as 0’s

18

AT43311

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